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<h1><a href="spanner_v1.html">Cloud Spanner API</a> . <a href="spanner_v1.projects.html">projects</a> . <a href="spanner_v1.projects.instances.html">instances</a></h1>
<h2>Instance Methods</h2>
<p class="toc_element">
  <code><a href="spanner_v1.projects.instances.backupOperations.html">backupOperations()</a></code>
</p>
<p class="firstline">Returns the backupOperations Resource.</p>

<p class="toc_element">
  <code><a href="spanner_v1.projects.instances.backups.html">backups()</a></code>
</p>
<p class="firstline">Returns the backups Resource.</p>

<p class="toc_element">
  <code><a href="spanner_v1.projects.instances.databaseOperations.html">databaseOperations()</a></code>
</p>
<p class="firstline">Returns the databaseOperations Resource.</p>

<p class="toc_element">
  <code><a href="spanner_v1.projects.instances.databases.html">databases()</a></code>
</p>
<p class="firstline">Returns the databases Resource.</p>

<p class="toc_element">
  <code><a href="spanner_v1.projects.instances.instancePartitionOperations.html">instancePartitionOperations()</a></code>
</p>
<p class="firstline">Returns the instancePartitionOperations Resource.</p>

<p class="toc_element">
  <code><a href="spanner_v1.projects.instances.instancePartitions.html">instancePartitions()</a></code>
</p>
<p class="firstline">Returns the instancePartitions Resource.</p>

<p class="toc_element">
  <code><a href="spanner_v1.projects.instances.operations.html">operations()</a></code>
</p>
<p class="firstline">Returns the operations Resource.</p>

<p class="toc_element">
  <code><a href="#close">close()</a></code></p>
<p class="firstline">Close httplib2 connections.</p>
<p class="toc_element">
  <code><a href="#create">create(parent, body=None, x__xgafv=None)</a></code></p>
<p class="firstline">Creates an instance and begins preparing it to begin serving. The returned long-running operation can be used to track the progress of preparing the new instance. The instance name is assigned by the caller. If the named instance already exists, `CreateInstance` returns `ALREADY_EXISTS`. Immediately upon completion of this request: * The instance is readable via the API, with all requested attributes but no allocated resources. Its state is `CREATING`. Until completion of the returned operation: * Cancelling the operation renders the instance immediately unreadable via the API. * The instance can be deleted. * All other attempts to modify the instance are rejected. Upon completion of the returned operation: * Billing for all successfully-allocated resources begins (some types may have lower than the requested levels). * Databases can be created in the instance. * The instance's allocated resource levels are readable via the API. * The instance's state becomes `READY`. The returned long-running operation will have a name of the format `/operations/` and can be used to track creation of the instance. The metadata field type is CreateInstanceMetadata. The response field type is Instance, if successful.</p>
<p class="toc_element">
  <code><a href="#delete">delete(name, x__xgafv=None)</a></code></p>
<p class="firstline">Deletes an instance. Immediately upon completion of the request: * Billing ceases for all of the instance's reserved resources. Soon afterward: * The instance and *all of its databases* immediately and irrevocably disappear from the API. All data in the databases is permanently deleted.</p>
<p class="toc_element">
  <code><a href="#get">get(name, fieldMask=None, x__xgafv=None)</a></code></p>
<p class="firstline">Gets information about a particular instance.</p>
<p class="toc_element">
  <code><a href="#getIamPolicy">getIamPolicy(resource, body=None, x__xgafv=None)</a></code></p>
<p class="firstline">Gets the access control policy for an instance resource. Returns an empty policy if an instance exists but does not have a policy set. Authorization requires `spanner.instances.getIamPolicy` on resource.</p>
<p class="toc_element">
  <code><a href="#list">list(parent, filter=None, instanceDeadline=None, pageSize=None, pageToken=None, x__xgafv=None)</a></code></p>
<p class="firstline">Lists all instances in the given project.</p>
<p class="toc_element">
  <code><a href="#list_next">list_next()</a></code></p>
<p class="firstline">Retrieves the next page of results.</p>
<p class="toc_element">
  <code><a href="#move">move(name, body=None, x__xgafv=None)</a></code></p>
<p class="firstline">Moves an instance to the target instance configuration. You can use the returned long-running operation to track the progress of moving the instance. `MoveInstance` returns `FAILED_PRECONDITION` if the instance meets any of the following criteria: * Is undergoing a move to a different instance configuration * Has backups * Has an ongoing update * Contains any CMEK-enabled databases * Is a free trial instance While the operation is pending: * All other attempts to modify the instance, including changes to its compute capacity, are rejected. * The following database and backup admin operations are rejected: * `DatabaseAdmin.CreateDatabase` * `DatabaseAdmin.UpdateDatabaseDdl` (disabled if default_leader is specified in the request.) * `DatabaseAdmin.RestoreDatabase` * `DatabaseAdmin.CreateBackup` * `DatabaseAdmin.CopyBackup` * Both the source and target instance configurations are subject to hourly compute and storage charges. * The instance might experience higher read-write latencies and a higher transaction abort rate. However, moving an instance doesn't cause any downtime. The returned long-running operation has a name of the format `/operations/` and can be used to track the move instance operation. The metadata field type is MoveInstanceMetadata. The response field type is Instance, if successful. Cancelling the operation sets its metadata's cancel_time. Cancellation is not immediate because it involves moving any data previously moved to the target instance configuration back to the original instance configuration. You can use this operation to track the progress of the cancellation. Upon successful completion of the cancellation, the operation terminates with `CANCELLED` status. If not cancelled, upon completion of the returned operation: * The instance successfully moves to the target instance configuration. * You are billed for compute and storage in target instance configuration. Authorization requires the `spanner.instances.update` permission on the resource instance. For more details, see [Move an instance](https://cloud.google.com/spanner/docs/move-instance).</p>
<p class="toc_element">
  <code><a href="#patch">patch(name, body=None, x__xgafv=None)</a></code></p>
<p class="firstline">Updates an instance, and begins allocating or releasing resources as requested. The returned long-running operation can be used to track the progress of updating the instance. If the named instance does not exist, returns `NOT_FOUND`. Immediately upon completion of this request: * For resource types for which a decrease in the instance's allocation has been requested, billing is based on the newly-requested level. Until completion of the returned operation: * Cancelling the operation sets its metadata's cancel_time, and begins restoring resources to their pre-request values. The operation is guaranteed to succeed at undoing all resource changes, after which point it terminates with a `CANCELLED` status. * All other attempts to modify the instance are rejected. * Reading the instance via the API continues to give the pre-request resource levels. Upon completion of the returned operation: * Billing begins for all successfully-allocated resources (some types may have lower than the requested levels). * All newly-reserved resources are available for serving the instance's tables. * The instance's new resource levels are readable via the API. The returned long-running operation will have a name of the format `/operations/` and can be used to track the instance modification. The metadata field type is UpdateInstanceMetadata. The response field type is Instance, if successful. Authorization requires `spanner.instances.update` permission on the resource name.</p>
<p class="toc_element">
  <code><a href="#setIamPolicy">setIamPolicy(resource, body=None, x__xgafv=None)</a></code></p>
<p class="firstline">Sets the access control policy on an instance resource. Replaces any existing policy. Authorization requires `spanner.instances.setIamPolicy` on resource.</p>
<p class="toc_element">
  <code><a href="#testIamPermissions">testIamPermissions(resource, body=None, x__xgafv=None)</a></code></p>
<p class="firstline">Returns permissions that the caller has on the specified instance resource. Attempting this RPC on a non-existent Cloud Spanner instance resource will result in a NOT_FOUND error if the user has `spanner.instances.list` permission on the containing Google Cloud Project. Otherwise returns an empty set of permissions.</p>
<h3>Method Details</h3>
<div class="method">
    <code class="details" id="close">close()</code>
  <pre>Close httplib2 connections.</pre>
</div>

<div class="method">
    <code class="details" id="create">create(parent, body=None, x__xgafv=None)</code>
  <pre>Creates an instance and begins preparing it to begin serving. The returned long-running operation can be used to track the progress of preparing the new instance. The instance name is assigned by the caller. If the named instance already exists, `CreateInstance` returns `ALREADY_EXISTS`. Immediately upon completion of this request: * The instance is readable via the API, with all requested attributes but no allocated resources. Its state is `CREATING`. Until completion of the returned operation: * Cancelling the operation renders the instance immediately unreadable via the API. * The instance can be deleted. * All other attempts to modify the instance are rejected. Upon completion of the returned operation: * Billing for all successfully-allocated resources begins (some types may have lower than the requested levels). * Databases can be created in the instance. * The instance&#x27;s allocated resource levels are readable via the API. * The instance&#x27;s state becomes `READY`. The returned long-running operation will have a name of the format `/operations/` and can be used to track creation of the instance. The metadata field type is CreateInstanceMetadata. The response field type is Instance, if successful.

Args:
  parent: string, Required. The name of the project in which to create the instance. Values are of the form `projects/`. (required)
  body: object, The request body.
    The object takes the form of:

{ # The request for CreateInstance.
  &quot;instance&quot;: { # An isolated set of Cloud Spanner resources on which databases can be hosted. # Required. The instance to create. The name may be omitted, but if specified must be `/instances/`.
    &quot;autoscalingConfig&quot;: { # Autoscaling configuration for an instance. # Optional. The autoscaling configuration. Autoscaling is enabled if this field is set. When autoscaling is enabled, node_count and processing_units are treated as OUTPUT_ONLY fields and reflect the current compute capacity allocated to the instance.
      &quot;asymmetricAutoscalingOptions&quot;: [ # Optional. Optional asymmetric autoscaling options. Replicas matching the replica selection criteria will be autoscaled independently from other replicas. The autoscaler will scale the replicas based on the utilization of replicas identified by the replica selection. Replica selections should not overlap with each other. Other replicas (those do not match any replica selection) will be autoscaled together and will have the same compute capacity allocated to them.
        { # AsymmetricAutoscalingOption specifies the scaling of replicas identified by the given selection.
          &quot;overrides&quot;: { # Overrides the top-level autoscaling configuration for the replicas identified by `replica_selection`. All fields in this message are optional. Any unspecified fields will use the corresponding values from the top-level autoscaling configuration. # Optional. Overrides applied to the top-level autoscaling configuration for the selected replicas.
            &quot;autoscalingLimits&quot;: { # The autoscaling limits for the instance. Users can define the minimum and maximum compute capacity allocated to the instance, and the autoscaler will only scale within that range. Users can either use nodes or processing units to specify the limits, but should use the same unit to set both the min_limit and max_limit. # Optional. If specified, overrides the min/max limit in the top-level autoscaling configuration for the selected replicas.
              &quot;maxNodes&quot;: 42, # Maximum number of nodes allocated to the instance. If set, this number should be greater than or equal to min_nodes.
              &quot;maxProcessingUnits&quot;: 42, # Maximum number of processing units allocated to the instance. If set, this number should be multiples of 1000 and be greater than or equal to min_processing_units.
              &quot;minNodes&quot;: 42, # Minimum number of nodes allocated to the instance. If set, this number should be greater than or equal to 1.
              &quot;minProcessingUnits&quot;: 42, # Minimum number of processing units allocated to the instance. If set, this number should be multiples of 1000.
            },
            &quot;autoscalingTargetHighPriorityCpuUtilizationPercent&quot;: 42, # Optional. If specified, overrides the autoscaling target high_priority_cpu_utilization_percent in the top-level autoscaling configuration for the selected replicas.
          },
          &quot;replicaSelection&quot;: { # ReplicaSelection identifies replicas with common properties. # Required. Selects the replicas to which this AsymmetricAutoscalingOption applies. Only read-only replicas are supported.
            &quot;location&quot;: &quot;A String&quot;, # Required. Name of the location of the replicas (for example, &quot;us-central1&quot;).
          },
        },
      ],
      &quot;autoscalingLimits&quot;: { # The autoscaling limits for the instance. Users can define the minimum and maximum compute capacity allocated to the instance, and the autoscaler will only scale within that range. Users can either use nodes or processing units to specify the limits, but should use the same unit to set both the min_limit and max_limit. # Required. Autoscaling limits for an instance.
        &quot;maxNodes&quot;: 42, # Maximum number of nodes allocated to the instance. If set, this number should be greater than or equal to min_nodes.
        &quot;maxProcessingUnits&quot;: 42, # Maximum number of processing units allocated to the instance. If set, this number should be multiples of 1000 and be greater than or equal to min_processing_units.
        &quot;minNodes&quot;: 42, # Minimum number of nodes allocated to the instance. If set, this number should be greater than or equal to 1.
        &quot;minProcessingUnits&quot;: 42, # Minimum number of processing units allocated to the instance. If set, this number should be multiples of 1000.
      },
      &quot;autoscalingTargets&quot;: { # The autoscaling targets for an instance. # Required. The autoscaling targets for an instance.
        &quot;highPriorityCpuUtilizationPercent&quot;: 42, # Required. The target high priority cpu utilization percentage that the autoscaler should be trying to achieve for the instance. This number is on a scale from 0 (no utilization) to 100 (full utilization). The valid range is [10, 90] inclusive.
        &quot;storageUtilizationPercent&quot;: 42, # Required. The target storage utilization percentage that the autoscaler should be trying to achieve for the instance. This number is on a scale from 0 (no utilization) to 100 (full utilization). The valid range is [10, 99] inclusive.
      },
    },
    &quot;config&quot;: &quot;A String&quot;, # Required. The name of the instance&#x27;s configuration. Values are of the form `projects//instanceConfigs/`. See also InstanceConfig and ListInstanceConfigs.
    &quot;createTime&quot;: &quot;A String&quot;, # Output only. The time at which the instance was created.
    &quot;defaultBackupScheduleType&quot;: &quot;A String&quot;, # Optional. Controls the default backup schedule behavior for new databases within the instance. By default, a backup schedule is created automatically when a new database is created in a new instance. Note that the `AUTOMATIC` value isn&#x27;t permitted for free instances, as backups and backup schedules aren&#x27;t supported for free instances. In the `GetInstance` or `ListInstances` response, if the value of `default_backup_schedule_type` isn&#x27;t set, or set to `NONE`, Spanner doesn&#x27;t create a default backup schedule for new databases in the instance.
    &quot;displayName&quot;: &quot;A String&quot;, # Required. The descriptive name for this instance as it appears in UIs. Must be unique per project and between 4 and 30 characters in length.
    &quot;edition&quot;: &quot;A String&quot;, # Optional. The `Edition` of the current instance.
    &quot;endpointUris&quot;: [ # Deprecated. This field is not populated.
      &quot;A String&quot;,
    ],
    &quot;freeInstanceMetadata&quot;: { # Free instance specific metadata that is kept even after an instance has been upgraded for tracking purposes. # Free instance metadata. Only populated for free instances.
      &quot;expireBehavior&quot;: &quot;A String&quot;, # Specifies the expiration behavior of a free instance. The default of ExpireBehavior is `REMOVE_AFTER_GRACE_PERIOD`. This can be modified during or after creation, and before expiration.
      &quot;expireTime&quot;: &quot;A String&quot;, # Output only. Timestamp after which the instance will either be upgraded or scheduled for deletion after a grace period. ExpireBehavior is used to choose between upgrading or scheduling the free instance for deletion. This timestamp is set during the creation of a free instance.
      &quot;upgradeTime&quot;: &quot;A String&quot;, # Output only. If present, the timestamp at which the free instance was upgraded to a provisioned instance.
    },
    &quot;instanceType&quot;: &quot;A String&quot;, # The `InstanceType` of the current instance.
    &quot;labels&quot;: { # Cloud Labels are a flexible and lightweight mechanism for organizing cloud resources into groups that reflect a customer&#x27;s organizational needs and deployment strategies. Cloud Labels can be used to filter collections of resources. They can be used to control how resource metrics are aggregated. And they can be used as arguments to policy management rules (e.g. route, firewall, load balancing, etc.). * Label keys must be between 1 and 63 characters long and must conform to the following regular expression: `a-z{0,62}`. * Label values must be between 0 and 63 characters long and must conform to the regular expression `[a-z0-9_-]{0,63}`. * No more than 64 labels can be associated with a given resource. See https://goo.gl/xmQnxf for more information on and examples of labels. If you plan to use labels in your own code, please note that additional characters may be allowed in the future. And so you are advised to use an internal label representation, such as JSON, which doesn&#x27;t rely upon specific characters being disallowed. For example, representing labels as the string: name + &quot;_&quot; + value would prove problematic if we were to allow &quot;_&quot; in a future release.
      &quot;a_key&quot;: &quot;A String&quot;,
    },
    &quot;name&quot;: &quot;A String&quot;, # Required. A unique identifier for the instance, which cannot be changed after the instance is created. Values are of the form `projects//instances/a-z*[a-z0-9]`. The final segment of the name must be between 2 and 64 characters in length.
    &quot;nodeCount&quot;: 42, # The number of nodes allocated to this instance. At most, one of either `node_count` or `processing_units` should be present in the message. Users can set the `node_count` field to specify the target number of nodes allocated to the instance. If autoscaling is enabled, `node_count` is treated as an `OUTPUT_ONLY` field and reflects the current number of nodes allocated to the instance. This might be zero in API responses for instances that are not yet in the `READY` state. If the instance has varying node count across replicas (achieved by setting `asymmetric_autoscaling_options` in the autoscaling configuration), the `node_count` set here is the maximum node count across all replicas. For more information, see [Compute capacity, nodes, and processing units](https://cloud.google.com/spanner/docs/compute-capacity).
    &quot;processingUnits&quot;: 42, # The number of processing units allocated to this instance. At most, one of either `processing_units` or `node_count` should be present in the message. Users can set the `processing_units` field to specify the target number of processing units allocated to the instance. If autoscaling is enabled, `processing_units` is treated as an `OUTPUT_ONLY` field and reflects the current number of processing units allocated to the instance. This might be zero in API responses for instances that are not yet in the `READY` state. If the instance has varying processing units per replica (achieved by setting `asymmetric_autoscaling_options` in the autoscaling configuration), the `processing_units` set here is the maximum processing units across all replicas. For more information, see [Compute capacity, nodes and processing units](https://cloud.google.com/spanner/docs/compute-capacity).
    &quot;replicaComputeCapacity&quot;: [ # Output only. Lists the compute capacity per ReplicaSelection. A replica selection identifies a set of replicas with common properties. Replicas identified by a ReplicaSelection are scaled with the same compute capacity.
      { # ReplicaComputeCapacity describes the amount of server resources that are allocated to each replica identified by the replica selection.
        &quot;nodeCount&quot;: 42, # The number of nodes allocated to each replica. This may be zero in API responses for instances that are not yet in state `READY`.
        &quot;processingUnits&quot;: 42, # The number of processing units allocated to each replica. This may be zero in API responses for instances that are not yet in state `READY`.
        &quot;replicaSelection&quot;: { # ReplicaSelection identifies replicas with common properties. # Required. Identifies replicas by specified properties. All replicas in the selection have the same amount of compute capacity.
          &quot;location&quot;: &quot;A String&quot;, # Required. Name of the location of the replicas (for example, &quot;us-central1&quot;).
        },
      },
    ],
    &quot;state&quot;: &quot;A String&quot;, # Output only. The current instance state. For CreateInstance, the state must be either omitted or set to `CREATING`. For UpdateInstance, the state must be either omitted or set to `READY`.
    &quot;updateTime&quot;: &quot;A String&quot;, # Output only. The time at which the instance was most recently updated.
  },
  &quot;instanceId&quot;: &quot;A String&quot;, # Required. The ID of the instance to create. Valid identifiers are of the form `a-z*[a-z0-9]` and must be between 2 and 64 characters in length.
}

  x__xgafv: string, V1 error format.
    Allowed values
      1 - v1 error format
      2 - v2 error format

Returns:
  An object of the form:

    { # This resource represents a long-running operation that is the result of a network API call.
  &quot;done&quot;: True or False, # If the value is `false`, it means the operation is still in progress. If `true`, the operation is completed, and either `error` or `response` is available.
  &quot;error&quot;: { # The `Status` type defines a logical error model that is suitable for different programming environments, including REST APIs and RPC APIs. It is used by [gRPC](https://github.com/grpc). Each `Status` message contains three pieces of data: error code, error message, and error details. You can find out more about this error model and how to work with it in the [API Design Guide](https://cloud.google.com/apis/design/errors). # The error result of the operation in case of failure or cancellation.
    &quot;code&quot;: 42, # The status code, which should be an enum value of google.rpc.Code.
    &quot;details&quot;: [ # A list of messages that carry the error details. There is a common set of message types for APIs to use.
      {
        &quot;a_key&quot;: &quot;&quot;, # Properties of the object. Contains field @type with type URL.
      },
    ],
    &quot;message&quot;: &quot;A String&quot;, # A developer-facing error message, which should be in English. Any user-facing error message should be localized and sent in the google.rpc.Status.details field, or localized by the client.
  },
  &quot;metadata&quot;: { # Service-specific metadata associated with the operation. It typically contains progress information and common metadata such as create time. Some services might not provide such metadata. Any method that returns a long-running operation should document the metadata type, if any.
    &quot;a_key&quot;: &quot;&quot;, # Properties of the object. Contains field @type with type URL.
  },
  &quot;name&quot;: &quot;A String&quot;, # The server-assigned name, which is only unique within the same service that originally returns it. If you use the default HTTP mapping, the `name` should be a resource name ending with `operations/{unique_id}`.
  &quot;response&quot;: { # The normal, successful response of the operation. If the original method returns no data on success, such as `Delete`, the response is `google.protobuf.Empty`. If the original method is standard `Get`/`Create`/`Update`, the response should be the resource. For other methods, the response should have the type `XxxResponse`, where `Xxx` is the original method name. For example, if the original method name is `TakeSnapshot()`, the inferred response type is `TakeSnapshotResponse`.
    &quot;a_key&quot;: &quot;&quot;, # Properties of the object. Contains field @type with type URL.
  },
}</pre>
</div>

<div class="method">
    <code class="details" id="delete">delete(name, x__xgafv=None)</code>
  <pre>Deletes an instance. Immediately upon completion of the request: * Billing ceases for all of the instance&#x27;s reserved resources. Soon afterward: * The instance and *all of its databases* immediately and irrevocably disappear from the API. All data in the databases is permanently deleted.

Args:
  name: string, Required. The name of the instance to be deleted. Values are of the form `projects//instances/` (required)
  x__xgafv: string, V1 error format.
    Allowed values
      1 - v1 error format
      2 - v2 error format

Returns:
  An object of the form:

    { # A generic empty message that you can re-use to avoid defining duplicated empty messages in your APIs. A typical example is to use it as the request or the response type of an API method. For instance: service Foo { rpc Bar(google.protobuf.Empty) returns (google.protobuf.Empty); }
}</pre>
</div>

<div class="method">
    <code class="details" id="get">get(name, fieldMask=None, x__xgafv=None)</code>
  <pre>Gets information about a particular instance.

Args:
  name: string, Required. The name of the requested instance. Values are of the form `projects//instances/`. (required)
  fieldMask: string, If field_mask is present, specifies the subset of Instance fields that should be returned. If absent, all Instance fields are returned.
  x__xgafv: string, V1 error format.
    Allowed values
      1 - v1 error format
      2 - v2 error format

Returns:
  An object of the form:

    { # An isolated set of Cloud Spanner resources on which databases can be hosted.
  &quot;autoscalingConfig&quot;: { # Autoscaling configuration for an instance. # Optional. The autoscaling configuration. Autoscaling is enabled if this field is set. When autoscaling is enabled, node_count and processing_units are treated as OUTPUT_ONLY fields and reflect the current compute capacity allocated to the instance.
    &quot;asymmetricAutoscalingOptions&quot;: [ # Optional. Optional asymmetric autoscaling options. Replicas matching the replica selection criteria will be autoscaled independently from other replicas. The autoscaler will scale the replicas based on the utilization of replicas identified by the replica selection. Replica selections should not overlap with each other. Other replicas (those do not match any replica selection) will be autoscaled together and will have the same compute capacity allocated to them.
      { # AsymmetricAutoscalingOption specifies the scaling of replicas identified by the given selection.
        &quot;overrides&quot;: { # Overrides the top-level autoscaling configuration for the replicas identified by `replica_selection`. All fields in this message are optional. Any unspecified fields will use the corresponding values from the top-level autoscaling configuration. # Optional. Overrides applied to the top-level autoscaling configuration for the selected replicas.
          &quot;autoscalingLimits&quot;: { # The autoscaling limits for the instance. Users can define the minimum and maximum compute capacity allocated to the instance, and the autoscaler will only scale within that range. Users can either use nodes or processing units to specify the limits, but should use the same unit to set both the min_limit and max_limit. # Optional. If specified, overrides the min/max limit in the top-level autoscaling configuration for the selected replicas.
            &quot;maxNodes&quot;: 42, # Maximum number of nodes allocated to the instance. If set, this number should be greater than or equal to min_nodes.
            &quot;maxProcessingUnits&quot;: 42, # Maximum number of processing units allocated to the instance. If set, this number should be multiples of 1000 and be greater than or equal to min_processing_units.
            &quot;minNodes&quot;: 42, # Minimum number of nodes allocated to the instance. If set, this number should be greater than or equal to 1.
            &quot;minProcessingUnits&quot;: 42, # Minimum number of processing units allocated to the instance. If set, this number should be multiples of 1000.
          },
          &quot;autoscalingTargetHighPriorityCpuUtilizationPercent&quot;: 42, # Optional. If specified, overrides the autoscaling target high_priority_cpu_utilization_percent in the top-level autoscaling configuration for the selected replicas.
        },
        &quot;replicaSelection&quot;: { # ReplicaSelection identifies replicas with common properties. # Required. Selects the replicas to which this AsymmetricAutoscalingOption applies. Only read-only replicas are supported.
          &quot;location&quot;: &quot;A String&quot;, # Required. Name of the location of the replicas (for example, &quot;us-central1&quot;).
        },
      },
    ],
    &quot;autoscalingLimits&quot;: { # The autoscaling limits for the instance. Users can define the minimum and maximum compute capacity allocated to the instance, and the autoscaler will only scale within that range. Users can either use nodes or processing units to specify the limits, but should use the same unit to set both the min_limit and max_limit. # Required. Autoscaling limits for an instance.
      &quot;maxNodes&quot;: 42, # Maximum number of nodes allocated to the instance. If set, this number should be greater than or equal to min_nodes.
      &quot;maxProcessingUnits&quot;: 42, # Maximum number of processing units allocated to the instance. If set, this number should be multiples of 1000 and be greater than or equal to min_processing_units.
      &quot;minNodes&quot;: 42, # Minimum number of nodes allocated to the instance. If set, this number should be greater than or equal to 1.
      &quot;minProcessingUnits&quot;: 42, # Minimum number of processing units allocated to the instance. If set, this number should be multiples of 1000.
    },
    &quot;autoscalingTargets&quot;: { # The autoscaling targets for an instance. # Required. The autoscaling targets for an instance.
      &quot;highPriorityCpuUtilizationPercent&quot;: 42, # Required. The target high priority cpu utilization percentage that the autoscaler should be trying to achieve for the instance. This number is on a scale from 0 (no utilization) to 100 (full utilization). The valid range is [10, 90] inclusive.
      &quot;storageUtilizationPercent&quot;: 42, # Required. The target storage utilization percentage that the autoscaler should be trying to achieve for the instance. This number is on a scale from 0 (no utilization) to 100 (full utilization). The valid range is [10, 99] inclusive.
    },
  },
  &quot;config&quot;: &quot;A String&quot;, # Required. The name of the instance&#x27;s configuration. Values are of the form `projects//instanceConfigs/`. See also InstanceConfig and ListInstanceConfigs.
  &quot;createTime&quot;: &quot;A String&quot;, # Output only. The time at which the instance was created.
  &quot;defaultBackupScheduleType&quot;: &quot;A String&quot;, # Optional. Controls the default backup schedule behavior for new databases within the instance. By default, a backup schedule is created automatically when a new database is created in a new instance. Note that the `AUTOMATIC` value isn&#x27;t permitted for free instances, as backups and backup schedules aren&#x27;t supported for free instances. In the `GetInstance` or `ListInstances` response, if the value of `default_backup_schedule_type` isn&#x27;t set, or set to `NONE`, Spanner doesn&#x27;t create a default backup schedule for new databases in the instance.
  &quot;displayName&quot;: &quot;A String&quot;, # Required. The descriptive name for this instance as it appears in UIs. Must be unique per project and between 4 and 30 characters in length.
  &quot;edition&quot;: &quot;A String&quot;, # Optional. The `Edition` of the current instance.
  &quot;endpointUris&quot;: [ # Deprecated. This field is not populated.
    &quot;A String&quot;,
  ],
  &quot;freeInstanceMetadata&quot;: { # Free instance specific metadata that is kept even after an instance has been upgraded for tracking purposes. # Free instance metadata. Only populated for free instances.
    &quot;expireBehavior&quot;: &quot;A String&quot;, # Specifies the expiration behavior of a free instance. The default of ExpireBehavior is `REMOVE_AFTER_GRACE_PERIOD`. This can be modified during or after creation, and before expiration.
    &quot;expireTime&quot;: &quot;A String&quot;, # Output only. Timestamp after which the instance will either be upgraded or scheduled for deletion after a grace period. ExpireBehavior is used to choose between upgrading or scheduling the free instance for deletion. This timestamp is set during the creation of a free instance.
    &quot;upgradeTime&quot;: &quot;A String&quot;, # Output only. If present, the timestamp at which the free instance was upgraded to a provisioned instance.
  },
  &quot;instanceType&quot;: &quot;A String&quot;, # The `InstanceType` of the current instance.
  &quot;labels&quot;: { # Cloud Labels are a flexible and lightweight mechanism for organizing cloud resources into groups that reflect a customer&#x27;s organizational needs and deployment strategies. Cloud Labels can be used to filter collections of resources. They can be used to control how resource metrics are aggregated. And they can be used as arguments to policy management rules (e.g. route, firewall, load balancing, etc.). * Label keys must be between 1 and 63 characters long and must conform to the following regular expression: `a-z{0,62}`. * Label values must be between 0 and 63 characters long and must conform to the regular expression `[a-z0-9_-]{0,63}`. * No more than 64 labels can be associated with a given resource. See https://goo.gl/xmQnxf for more information on and examples of labels. If you plan to use labels in your own code, please note that additional characters may be allowed in the future. And so you are advised to use an internal label representation, such as JSON, which doesn&#x27;t rely upon specific characters being disallowed. For example, representing labels as the string: name + &quot;_&quot; + value would prove problematic if we were to allow &quot;_&quot; in a future release.
    &quot;a_key&quot;: &quot;A String&quot;,
  },
  &quot;name&quot;: &quot;A String&quot;, # Required. A unique identifier for the instance, which cannot be changed after the instance is created. Values are of the form `projects//instances/a-z*[a-z0-9]`. The final segment of the name must be between 2 and 64 characters in length.
  &quot;nodeCount&quot;: 42, # The number of nodes allocated to this instance. At most, one of either `node_count` or `processing_units` should be present in the message. Users can set the `node_count` field to specify the target number of nodes allocated to the instance. If autoscaling is enabled, `node_count` is treated as an `OUTPUT_ONLY` field and reflects the current number of nodes allocated to the instance. This might be zero in API responses for instances that are not yet in the `READY` state. If the instance has varying node count across replicas (achieved by setting `asymmetric_autoscaling_options` in the autoscaling configuration), the `node_count` set here is the maximum node count across all replicas. For more information, see [Compute capacity, nodes, and processing units](https://cloud.google.com/spanner/docs/compute-capacity).
  &quot;processingUnits&quot;: 42, # The number of processing units allocated to this instance. At most, one of either `processing_units` or `node_count` should be present in the message. Users can set the `processing_units` field to specify the target number of processing units allocated to the instance. If autoscaling is enabled, `processing_units` is treated as an `OUTPUT_ONLY` field and reflects the current number of processing units allocated to the instance. This might be zero in API responses for instances that are not yet in the `READY` state. If the instance has varying processing units per replica (achieved by setting `asymmetric_autoscaling_options` in the autoscaling configuration), the `processing_units` set here is the maximum processing units across all replicas. For more information, see [Compute capacity, nodes and processing units](https://cloud.google.com/spanner/docs/compute-capacity).
  &quot;replicaComputeCapacity&quot;: [ # Output only. Lists the compute capacity per ReplicaSelection. A replica selection identifies a set of replicas with common properties. Replicas identified by a ReplicaSelection are scaled with the same compute capacity.
    { # ReplicaComputeCapacity describes the amount of server resources that are allocated to each replica identified by the replica selection.
      &quot;nodeCount&quot;: 42, # The number of nodes allocated to each replica. This may be zero in API responses for instances that are not yet in state `READY`.
      &quot;processingUnits&quot;: 42, # The number of processing units allocated to each replica. This may be zero in API responses for instances that are not yet in state `READY`.
      &quot;replicaSelection&quot;: { # ReplicaSelection identifies replicas with common properties. # Required. Identifies replicas by specified properties. All replicas in the selection have the same amount of compute capacity.
        &quot;location&quot;: &quot;A String&quot;, # Required. Name of the location of the replicas (for example, &quot;us-central1&quot;).
      },
    },
  ],
  &quot;state&quot;: &quot;A String&quot;, # Output only. The current instance state. For CreateInstance, the state must be either omitted or set to `CREATING`. For UpdateInstance, the state must be either omitted or set to `READY`.
  &quot;updateTime&quot;: &quot;A String&quot;, # Output only. The time at which the instance was most recently updated.
}</pre>
</div>

<div class="method">
    <code class="details" id="getIamPolicy">getIamPolicy(resource, body=None, x__xgafv=None)</code>
  <pre>Gets the access control policy for an instance resource. Returns an empty policy if an instance exists but does not have a policy set. Authorization requires `spanner.instances.getIamPolicy` on resource.

Args:
  resource: string, REQUIRED: The Cloud Spanner resource for which the policy is being retrieved. The format is `projects//instances/` for instance resources and `projects//instances//databases/` for database resources. (required)
  body: object, The request body.
    The object takes the form of:

{ # Request message for `GetIamPolicy` method.
  &quot;options&quot;: { # Encapsulates settings provided to GetIamPolicy. # OPTIONAL: A `GetPolicyOptions` object for specifying options to `GetIamPolicy`.
    &quot;requestedPolicyVersion&quot;: 42, # Optional. The maximum policy version that will be used to format the policy. Valid values are 0, 1, and 3. Requests specifying an invalid value will be rejected. Requests for policies with any conditional role bindings must specify version 3. Policies with no conditional role bindings may specify any valid value or leave the field unset. The policy in the response might use the policy version that you specified, or it might use a lower policy version. For example, if you specify version 3, but the policy has no conditional role bindings, the response uses version 1. To learn which resources support conditions in their IAM policies, see the [IAM documentation](https://cloud.google.com/iam/help/conditions/resource-policies).
  },
}

  x__xgafv: string, V1 error format.
    Allowed values
      1 - v1 error format
      2 - v2 error format

Returns:
  An object of the form:

    { # An Identity and Access Management (IAM) policy, which specifies access controls for Google Cloud resources. A `Policy` is a collection of `bindings`. A `binding` binds one or more `members`, or principals, to a single `role`. Principals can be user accounts, service accounts, Google groups, and domains (such as G Suite). A `role` is a named list of permissions; each `role` can be an IAM predefined role or a user-created custom role. For some types of Google Cloud resources, a `binding` can also specify a `condition`, which is a logical expression that allows access to a resource only if the expression evaluates to `true`. A condition can add constraints based on attributes of the request, the resource, or both. To learn which resources support conditions in their IAM policies, see the [IAM documentation](https://cloud.google.com/iam/help/conditions/resource-policies). **JSON example:** ``` { &quot;bindings&quot;: [ { &quot;role&quot;: &quot;roles/resourcemanager.organizationAdmin&quot;, &quot;members&quot;: [ &quot;user:mike@example.com&quot;, &quot;group:admins@example.com&quot;, &quot;domain:google.com&quot;, &quot;serviceAccount:my-project-id@appspot.gserviceaccount.com&quot; ] }, { &quot;role&quot;: &quot;roles/resourcemanager.organizationViewer&quot;, &quot;members&quot;: [ &quot;user:eve@example.com&quot; ], &quot;condition&quot;: { &quot;title&quot;: &quot;expirable access&quot;, &quot;description&quot;: &quot;Does not grant access after Sep 2020&quot;, &quot;expression&quot;: &quot;request.time &lt; timestamp(&#x27;2020-10-01T00:00:00.000Z&#x27;)&quot;, } } ], &quot;etag&quot;: &quot;BwWWja0YfJA=&quot;, &quot;version&quot;: 3 } ``` **YAML example:** ``` bindings: - members: - user:mike@example.com - group:admins@example.com - domain:google.com - serviceAccount:my-project-id@appspot.gserviceaccount.com role: roles/resourcemanager.organizationAdmin - members: - user:eve@example.com role: roles/resourcemanager.organizationViewer condition: title: expirable access description: Does not grant access after Sep 2020 expression: request.time &lt; timestamp(&#x27;2020-10-01T00:00:00.000Z&#x27;) etag: BwWWja0YfJA= version: 3 ``` For a description of IAM and its features, see the [IAM documentation](https://cloud.google.com/iam/docs/).
  &quot;bindings&quot;: [ # Associates a list of `members`, or principals, with a `role`. Optionally, may specify a `condition` that determines how and when the `bindings` are applied. Each of the `bindings` must contain at least one principal. The `bindings` in a `Policy` can refer to up to 1,500 principals; up to 250 of these principals can be Google groups. Each occurrence of a principal counts towards these limits. For example, if the `bindings` grant 50 different roles to `user:alice@example.com`, and not to any other principal, then you can add another 1,450 principals to the `bindings` in the `Policy`.
    { # Associates `members`, or principals, with a `role`.
      &quot;condition&quot;: { # Represents a textual expression in the Common Expression Language (CEL) syntax. CEL is a C-like expression language. The syntax and semantics of CEL are documented at https://github.com/google/cel-spec. Example (Comparison): title: &quot;Summary size limit&quot; description: &quot;Determines if a summary is less than 100 chars&quot; expression: &quot;document.summary.size() &lt; 100&quot; Example (Equality): title: &quot;Requestor is owner&quot; description: &quot;Determines if requestor is the document owner&quot; expression: &quot;document.owner == request.auth.claims.email&quot; Example (Logic): title: &quot;Public documents&quot; description: &quot;Determine whether the document should be publicly visible&quot; expression: &quot;document.type != &#x27;private&#x27; &amp;&amp; document.type != &#x27;internal&#x27;&quot; Example (Data Manipulation): title: &quot;Notification string&quot; description: &quot;Create a notification string with a timestamp.&quot; expression: &quot;&#x27;New message received at &#x27; + string(document.create_time)&quot; The exact variables and functions that may be referenced within an expression are determined by the service that evaluates it. See the service documentation for additional information. # The condition that is associated with this binding. If the condition evaluates to `true`, then this binding applies to the current request. If the condition evaluates to `false`, then this binding does not apply to the current request. However, a different role binding might grant the same role to one or more of the principals in this binding. To learn which resources support conditions in their IAM policies, see the [IAM documentation](https://cloud.google.com/iam/help/conditions/resource-policies).
        &quot;description&quot;: &quot;A String&quot;, # Optional. Description of the expression. This is a longer text which describes the expression, e.g. when hovered over it in a UI.
        &quot;expression&quot;: &quot;A String&quot;, # Textual representation of an expression in Common Expression Language syntax.
        &quot;location&quot;: &quot;A String&quot;, # Optional. String indicating the location of the expression for error reporting, e.g. a file name and a position in the file.
        &quot;title&quot;: &quot;A String&quot;, # Optional. Title for the expression, i.e. a short string describing its purpose. This can be used e.g. in UIs which allow to enter the expression.
      },
      &quot;members&quot;: [ # Specifies the principals requesting access for a Google Cloud resource. `members` can have the following values: * `allUsers`: A special identifier that represents anyone who is on the internet; with or without a Google account. * `allAuthenticatedUsers`: A special identifier that represents anyone who is authenticated with a Google account or a service account. Does not include identities that come from external identity providers (IdPs) through identity federation. * `user:{emailid}`: An email address that represents a specific Google account. For example, `alice@example.com` . * `serviceAccount:{emailid}`: An email address that represents a Google service account. For example, `my-other-app@appspot.gserviceaccount.com`. * `serviceAccount:{projectid}.svc.id.goog[{namespace}/{kubernetes-sa}]`: An identifier for a [Kubernetes service account](https://cloud.google.com/kubernetes-engine/docs/how-to/kubernetes-service-accounts). For example, `my-project.svc.id.goog[my-namespace/my-kubernetes-sa]`. * `group:{emailid}`: An email address that represents a Google group. For example, `admins@example.com`. * `domain:{domain}`: The G Suite domain (primary) that represents all the users of that domain. For example, `google.com` or `example.com`. * `principal://iam.googleapis.com/locations/global/workforcePools/{pool_id}/subject/{subject_attribute_value}`: A single identity in a workforce identity pool. * `principalSet://iam.googleapis.com/locations/global/workforcePools/{pool_id}/group/{group_id}`: All workforce identities in a group. * `principalSet://iam.googleapis.com/locations/global/workforcePools/{pool_id}/attribute.{attribute_name}/{attribute_value}`: All workforce identities with a specific attribute value. * `principalSet://iam.googleapis.com/locations/global/workforcePools/{pool_id}/*`: All identities in a workforce identity pool. * `principal://iam.googleapis.com/projects/{project_number}/locations/global/workloadIdentityPools/{pool_id}/subject/{subject_attribute_value}`: A single identity in a workload identity pool. * `principalSet://iam.googleapis.com/projects/{project_number}/locations/global/workloadIdentityPools/{pool_id}/group/{group_id}`: A workload identity pool group. * `principalSet://iam.googleapis.com/projects/{project_number}/locations/global/workloadIdentityPools/{pool_id}/attribute.{attribute_name}/{attribute_value}`: All identities in a workload identity pool with a certain attribute. * `principalSet://iam.googleapis.com/projects/{project_number}/locations/global/workloadIdentityPools/{pool_id}/*`: All identities in a workload identity pool. * `deleted:user:{emailid}?uid={uniqueid}`: An email address (plus unique identifier) representing a user that has been recently deleted. For example, `alice@example.com?uid=123456789012345678901`. If the user is recovered, this value reverts to `user:{emailid}` and the recovered user retains the role in the binding. * `deleted:serviceAccount:{emailid}?uid={uniqueid}`: An email address (plus unique identifier) representing a service account that has been recently deleted. For example, `my-other-app@appspot.gserviceaccount.com?uid=123456789012345678901`. If the service account is undeleted, this value reverts to `serviceAccount:{emailid}` and the undeleted service account retains the role in the binding. * `deleted:group:{emailid}?uid={uniqueid}`: An email address (plus unique identifier) representing a Google group that has been recently deleted. For example, `admins@example.com?uid=123456789012345678901`. If the group is recovered, this value reverts to `group:{emailid}` and the recovered group retains the role in the binding. * `deleted:principal://iam.googleapis.com/locations/global/workforcePools/{pool_id}/subject/{subject_attribute_value}`: Deleted single identity in a workforce identity pool. For example, `deleted:principal://iam.googleapis.com/locations/global/workforcePools/my-pool-id/subject/my-subject-attribute-value`.
        &quot;A String&quot;,
      ],
      &quot;role&quot;: &quot;A String&quot;, # Role that is assigned to the list of `members`, or principals. For example, `roles/viewer`, `roles/editor`, or `roles/owner`. For an overview of the IAM roles and permissions, see the [IAM documentation](https://cloud.google.com/iam/docs/roles-overview). For a list of the available pre-defined roles, see [here](https://cloud.google.com/iam/docs/understanding-roles).
    },
  ],
  &quot;etag&quot;: &quot;A String&quot;, # `etag` is used for optimistic concurrency control as a way to help prevent simultaneous updates of a policy from overwriting each other. It is strongly suggested that systems make use of the `etag` in the read-modify-write cycle to perform policy updates in order to avoid race conditions: An `etag` is returned in the response to `getIamPolicy`, and systems are expected to put that etag in the request to `setIamPolicy` to ensure that their change will be applied to the same version of the policy. **Important:** If you use IAM Conditions, you must include the `etag` field whenever you call `setIamPolicy`. If you omit this field, then IAM allows you to overwrite a version `3` policy with a version `1` policy, and all of the conditions in the version `3` policy are lost.
  &quot;version&quot;: 42, # Specifies the format of the policy. Valid values are `0`, `1`, and `3`. Requests that specify an invalid value are rejected. Any operation that affects conditional role bindings must specify version `3`. This requirement applies to the following operations: * Getting a policy that includes a conditional role binding * Adding a conditional role binding to a policy * Changing a conditional role binding in a policy * Removing any role binding, with or without a condition, from a policy that includes conditions **Important:** If you use IAM Conditions, you must include the `etag` field whenever you call `setIamPolicy`. If you omit this field, then IAM allows you to overwrite a version `3` policy with a version `1` policy, and all of the conditions in the version `3` policy are lost. If a policy does not include any conditions, operations on that policy may specify any valid version or leave the field unset. To learn which resources support conditions in their IAM policies, see the [IAM documentation](https://cloud.google.com/iam/help/conditions/resource-policies).
}</pre>
</div>

<div class="method">
    <code class="details" id="list">list(parent, filter=None, instanceDeadline=None, pageSize=None, pageToken=None, x__xgafv=None)</code>
  <pre>Lists all instances in the given project.

Args:
  parent: string, Required. The name of the project for which a list of instances is requested. Values are of the form `projects/`. (required)
  filter: string, An expression for filtering the results of the request. Filter rules are case insensitive. The fields eligible for filtering are: * `name` * `display_name` * `labels.key` where key is the name of a label Some examples of using filters are: * `name:*` --&gt; The instance has a name. * `name:Howl` --&gt; The instance&#x27;s name contains the string &quot;howl&quot;. * `name:HOWL` --&gt; Equivalent to above. * `NAME:howl` --&gt; Equivalent to above. * `labels.env:*` --&gt; The instance has the label &quot;env&quot;. * `labels.env:dev` --&gt; The instance has the label &quot;env&quot; and the value of the label contains the string &quot;dev&quot;. * `name:howl labels.env:dev` --&gt; The instance&#x27;s name contains &quot;howl&quot; and it has the label &quot;env&quot; with its value containing &quot;dev&quot;.
  instanceDeadline: string, Deadline used while retrieving metadata for instances. Instances whose metadata cannot be retrieved within this deadline will be added to unreachable in ListInstancesResponse.
  pageSize: integer, Number of instances to be returned in the response. If 0 or less, defaults to the server&#x27;s maximum allowed page size.
  pageToken: string, If non-empty, `page_token` should contain a next_page_token from a previous ListInstancesResponse.
  x__xgafv: string, V1 error format.
    Allowed values
      1 - v1 error format
      2 - v2 error format

Returns:
  An object of the form:

    { # The response for ListInstances.
  &quot;instances&quot;: [ # The list of requested instances.
    { # An isolated set of Cloud Spanner resources on which databases can be hosted.
      &quot;autoscalingConfig&quot;: { # Autoscaling configuration for an instance. # Optional. The autoscaling configuration. Autoscaling is enabled if this field is set. When autoscaling is enabled, node_count and processing_units are treated as OUTPUT_ONLY fields and reflect the current compute capacity allocated to the instance.
        &quot;asymmetricAutoscalingOptions&quot;: [ # Optional. Optional asymmetric autoscaling options. Replicas matching the replica selection criteria will be autoscaled independently from other replicas. The autoscaler will scale the replicas based on the utilization of replicas identified by the replica selection. Replica selections should not overlap with each other. Other replicas (those do not match any replica selection) will be autoscaled together and will have the same compute capacity allocated to them.
          { # AsymmetricAutoscalingOption specifies the scaling of replicas identified by the given selection.
            &quot;overrides&quot;: { # Overrides the top-level autoscaling configuration for the replicas identified by `replica_selection`. All fields in this message are optional. Any unspecified fields will use the corresponding values from the top-level autoscaling configuration. # Optional. Overrides applied to the top-level autoscaling configuration for the selected replicas.
              &quot;autoscalingLimits&quot;: { # The autoscaling limits for the instance. Users can define the minimum and maximum compute capacity allocated to the instance, and the autoscaler will only scale within that range. Users can either use nodes or processing units to specify the limits, but should use the same unit to set both the min_limit and max_limit. # Optional. If specified, overrides the min/max limit in the top-level autoscaling configuration for the selected replicas.
                &quot;maxNodes&quot;: 42, # Maximum number of nodes allocated to the instance. If set, this number should be greater than or equal to min_nodes.
                &quot;maxProcessingUnits&quot;: 42, # Maximum number of processing units allocated to the instance. If set, this number should be multiples of 1000 and be greater than or equal to min_processing_units.
                &quot;minNodes&quot;: 42, # Minimum number of nodes allocated to the instance. If set, this number should be greater than or equal to 1.
                &quot;minProcessingUnits&quot;: 42, # Minimum number of processing units allocated to the instance. If set, this number should be multiples of 1000.
              },
              &quot;autoscalingTargetHighPriorityCpuUtilizationPercent&quot;: 42, # Optional. If specified, overrides the autoscaling target high_priority_cpu_utilization_percent in the top-level autoscaling configuration for the selected replicas.
            },
            &quot;replicaSelection&quot;: { # ReplicaSelection identifies replicas with common properties. # Required. Selects the replicas to which this AsymmetricAutoscalingOption applies. Only read-only replicas are supported.
              &quot;location&quot;: &quot;A String&quot;, # Required. Name of the location of the replicas (for example, &quot;us-central1&quot;).
            },
          },
        ],
        &quot;autoscalingLimits&quot;: { # The autoscaling limits for the instance. Users can define the minimum and maximum compute capacity allocated to the instance, and the autoscaler will only scale within that range. Users can either use nodes or processing units to specify the limits, but should use the same unit to set both the min_limit and max_limit. # Required. Autoscaling limits for an instance.
          &quot;maxNodes&quot;: 42, # Maximum number of nodes allocated to the instance. If set, this number should be greater than or equal to min_nodes.
          &quot;maxProcessingUnits&quot;: 42, # Maximum number of processing units allocated to the instance. If set, this number should be multiples of 1000 and be greater than or equal to min_processing_units.
          &quot;minNodes&quot;: 42, # Minimum number of nodes allocated to the instance. If set, this number should be greater than or equal to 1.
          &quot;minProcessingUnits&quot;: 42, # Minimum number of processing units allocated to the instance. If set, this number should be multiples of 1000.
        },
        &quot;autoscalingTargets&quot;: { # The autoscaling targets for an instance. # Required. The autoscaling targets for an instance.
          &quot;highPriorityCpuUtilizationPercent&quot;: 42, # Required. The target high priority cpu utilization percentage that the autoscaler should be trying to achieve for the instance. This number is on a scale from 0 (no utilization) to 100 (full utilization). The valid range is [10, 90] inclusive.
          &quot;storageUtilizationPercent&quot;: 42, # Required. The target storage utilization percentage that the autoscaler should be trying to achieve for the instance. This number is on a scale from 0 (no utilization) to 100 (full utilization). The valid range is [10, 99] inclusive.
        },
      },
      &quot;config&quot;: &quot;A String&quot;, # Required. The name of the instance&#x27;s configuration. Values are of the form `projects//instanceConfigs/`. See also InstanceConfig and ListInstanceConfigs.
      &quot;createTime&quot;: &quot;A String&quot;, # Output only. The time at which the instance was created.
      &quot;defaultBackupScheduleType&quot;: &quot;A String&quot;, # Optional. Controls the default backup schedule behavior for new databases within the instance. By default, a backup schedule is created automatically when a new database is created in a new instance. Note that the `AUTOMATIC` value isn&#x27;t permitted for free instances, as backups and backup schedules aren&#x27;t supported for free instances. In the `GetInstance` or `ListInstances` response, if the value of `default_backup_schedule_type` isn&#x27;t set, or set to `NONE`, Spanner doesn&#x27;t create a default backup schedule for new databases in the instance.
      &quot;displayName&quot;: &quot;A String&quot;, # Required. The descriptive name for this instance as it appears in UIs. Must be unique per project and between 4 and 30 characters in length.
      &quot;edition&quot;: &quot;A String&quot;, # Optional. The `Edition` of the current instance.
      &quot;endpointUris&quot;: [ # Deprecated. This field is not populated.
        &quot;A String&quot;,
      ],
      &quot;freeInstanceMetadata&quot;: { # Free instance specific metadata that is kept even after an instance has been upgraded for tracking purposes. # Free instance metadata. Only populated for free instances.
        &quot;expireBehavior&quot;: &quot;A String&quot;, # Specifies the expiration behavior of a free instance. The default of ExpireBehavior is `REMOVE_AFTER_GRACE_PERIOD`. This can be modified during or after creation, and before expiration.
        &quot;expireTime&quot;: &quot;A String&quot;, # Output only. Timestamp after which the instance will either be upgraded or scheduled for deletion after a grace period. ExpireBehavior is used to choose between upgrading or scheduling the free instance for deletion. This timestamp is set during the creation of a free instance.
        &quot;upgradeTime&quot;: &quot;A String&quot;, # Output only. If present, the timestamp at which the free instance was upgraded to a provisioned instance.
      },
      &quot;instanceType&quot;: &quot;A String&quot;, # The `InstanceType` of the current instance.
      &quot;labels&quot;: { # Cloud Labels are a flexible and lightweight mechanism for organizing cloud resources into groups that reflect a customer&#x27;s organizational needs and deployment strategies. Cloud Labels can be used to filter collections of resources. They can be used to control how resource metrics are aggregated. And they can be used as arguments to policy management rules (e.g. route, firewall, load balancing, etc.). * Label keys must be between 1 and 63 characters long and must conform to the following regular expression: `a-z{0,62}`. * Label values must be between 0 and 63 characters long and must conform to the regular expression `[a-z0-9_-]{0,63}`. * No more than 64 labels can be associated with a given resource. See https://goo.gl/xmQnxf for more information on and examples of labels. If you plan to use labels in your own code, please note that additional characters may be allowed in the future. And so you are advised to use an internal label representation, such as JSON, which doesn&#x27;t rely upon specific characters being disallowed. For example, representing labels as the string: name + &quot;_&quot; + value would prove problematic if we were to allow &quot;_&quot; in a future release.
        &quot;a_key&quot;: &quot;A String&quot;,
      },
      &quot;name&quot;: &quot;A String&quot;, # Required. A unique identifier for the instance, which cannot be changed after the instance is created. Values are of the form `projects//instances/a-z*[a-z0-9]`. The final segment of the name must be between 2 and 64 characters in length.
      &quot;nodeCount&quot;: 42, # The number of nodes allocated to this instance. At most, one of either `node_count` or `processing_units` should be present in the message. Users can set the `node_count` field to specify the target number of nodes allocated to the instance. If autoscaling is enabled, `node_count` is treated as an `OUTPUT_ONLY` field and reflects the current number of nodes allocated to the instance. This might be zero in API responses for instances that are not yet in the `READY` state. If the instance has varying node count across replicas (achieved by setting `asymmetric_autoscaling_options` in the autoscaling configuration), the `node_count` set here is the maximum node count across all replicas. For more information, see [Compute capacity, nodes, and processing units](https://cloud.google.com/spanner/docs/compute-capacity).
      &quot;processingUnits&quot;: 42, # The number of processing units allocated to this instance. At most, one of either `processing_units` or `node_count` should be present in the message. Users can set the `processing_units` field to specify the target number of processing units allocated to the instance. If autoscaling is enabled, `processing_units` is treated as an `OUTPUT_ONLY` field and reflects the current number of processing units allocated to the instance. This might be zero in API responses for instances that are not yet in the `READY` state. If the instance has varying processing units per replica (achieved by setting `asymmetric_autoscaling_options` in the autoscaling configuration), the `processing_units` set here is the maximum processing units across all replicas. For more information, see [Compute capacity, nodes and processing units](https://cloud.google.com/spanner/docs/compute-capacity).
      &quot;replicaComputeCapacity&quot;: [ # Output only. Lists the compute capacity per ReplicaSelection. A replica selection identifies a set of replicas with common properties. Replicas identified by a ReplicaSelection are scaled with the same compute capacity.
        { # ReplicaComputeCapacity describes the amount of server resources that are allocated to each replica identified by the replica selection.
          &quot;nodeCount&quot;: 42, # The number of nodes allocated to each replica. This may be zero in API responses for instances that are not yet in state `READY`.
          &quot;processingUnits&quot;: 42, # The number of processing units allocated to each replica. This may be zero in API responses for instances that are not yet in state `READY`.
          &quot;replicaSelection&quot;: { # ReplicaSelection identifies replicas with common properties. # Required. Identifies replicas by specified properties. All replicas in the selection have the same amount of compute capacity.
            &quot;location&quot;: &quot;A String&quot;, # Required. Name of the location of the replicas (for example, &quot;us-central1&quot;).
          },
        },
      ],
      &quot;state&quot;: &quot;A String&quot;, # Output only. The current instance state. For CreateInstance, the state must be either omitted or set to `CREATING`. For UpdateInstance, the state must be either omitted or set to `READY`.
      &quot;updateTime&quot;: &quot;A String&quot;, # Output only. The time at which the instance was most recently updated.
    },
  ],
  &quot;nextPageToken&quot;: &quot;A String&quot;, # `next_page_token` can be sent in a subsequent ListInstances call to fetch more of the matching instances.
  &quot;unreachable&quot;: [ # The list of unreachable instances. It includes the names of instances whose metadata could not be retrieved within instance_deadline.
    &quot;A String&quot;,
  ],
}</pre>
</div>

<div class="method">
    <code class="details" id="list_next">list_next()</code>
  <pre>Retrieves the next page of results.

        Args:
          previous_request: The request for the previous page. (required)
          previous_response: The response from the request for the previous page. (required)

        Returns:
          A request object that you can call &#x27;execute()&#x27; on to request the next
          page. Returns None if there are no more items in the collection.
        </pre>
</div>

<div class="method">
    <code class="details" id="move">move(name, body=None, x__xgafv=None)</code>
  <pre>Moves an instance to the target instance configuration. You can use the returned long-running operation to track the progress of moving the instance. `MoveInstance` returns `FAILED_PRECONDITION` if the instance meets any of the following criteria: * Is undergoing a move to a different instance configuration * Has backups * Has an ongoing update * Contains any CMEK-enabled databases * Is a free trial instance While the operation is pending: * All other attempts to modify the instance, including changes to its compute capacity, are rejected. * The following database and backup admin operations are rejected: * `DatabaseAdmin.CreateDatabase` * `DatabaseAdmin.UpdateDatabaseDdl` (disabled if default_leader is specified in the request.) * `DatabaseAdmin.RestoreDatabase` * `DatabaseAdmin.CreateBackup` * `DatabaseAdmin.CopyBackup` * Both the source and target instance configurations are subject to hourly compute and storage charges. * The instance might experience higher read-write latencies and a higher transaction abort rate. However, moving an instance doesn&#x27;t cause any downtime. The returned long-running operation has a name of the format `/operations/` and can be used to track the move instance operation. The metadata field type is MoveInstanceMetadata. The response field type is Instance, if successful. Cancelling the operation sets its metadata&#x27;s cancel_time. Cancellation is not immediate because it involves moving any data previously moved to the target instance configuration back to the original instance configuration. You can use this operation to track the progress of the cancellation. Upon successful completion of the cancellation, the operation terminates with `CANCELLED` status. If not cancelled, upon completion of the returned operation: * The instance successfully moves to the target instance configuration. * You are billed for compute and storage in target instance configuration. Authorization requires the `spanner.instances.update` permission on the resource instance. For more details, see [Move an instance](https://cloud.google.com/spanner/docs/move-instance).

Args:
  name: string, Required. The instance to move. Values are of the form `projects//instances/`. (required)
  body: object, The request body.
    The object takes the form of:

{ # The request for MoveInstance.
  &quot;targetConfig&quot;: &quot;A String&quot;, # Required. The target instance configuration where to move the instance. Values are of the form `projects//instanceConfigs/`.
  &quot;targetDatabaseMoveConfigs&quot;: [ # Optional. The configuration for each database in the target instance configuration.
    { # The configuration for each database in the target instance configuration.
      &quot;databaseId&quot;: &quot;A String&quot;, # Required. The unique identifier of the database resource in the Instance. For example, if the database uri is `projects/foo/instances/bar/databases/baz`, then the id to supply here is baz.
      &quot;encryptionConfig&quot;: { # Encryption configuration for a Cloud Spanner database. # Optional. Encryption configuration to be used for the database in the target configuration. The encryption configuration must be specified for every database which currently uses CMEK encryption. If a database currently uses Google-managed encryption and a target encryption configuration is not specified, then the database defaults to Google-managed encryption. If a database currently uses Google-managed encryption and a target CMEK encryption is specified, the request is rejected. If a database currently uses CMEK encryption, then a target encryption configuration must be specified. You can&#x27;t move a CMEK database to a Google-managed encryption database using the MoveInstance API.
        &quot;kmsKeyName&quot;: &quot;A String&quot;, # Optional. This field is maintained for backwards compatibility. For new callers, we recommend using `kms_key_names` to specify the KMS key. Only use `kms_key_name` if the location of the KMS key matches the database instance&#x27;s configuration (location) exactly. For example, if the KMS location is in `us-central1` or `nam3`, then the database instance must also be in `us-central1` or `nam3`. The Cloud KMS key that is used to encrypt and decrypt the restored database. Values are of the form `projects//locations//keyRings//cryptoKeys/`.
        &quot;kmsKeyNames&quot;: [ # Optional. Specifies the KMS configuration for one or more keys used to encrypt the database. Values are of the form `projects//locations//keyRings//cryptoKeys/`. The keys referenced by `kms_key_names` must fully cover all regions of the database&#x27;s instance configuration. Some examples: * For regional (single-region) instance configurations, specify a regional location KMS key. * For multi-region instance configurations of type `GOOGLE_MANAGED`, either specify a multi-region location KMS key or multiple regional location KMS keys that cover all regions in the instance configuration. * For an instance configuration of type `USER_MANAGED`, specify only regional location KMS keys to cover each region in the instance configuration. Multi-region location KMS keys aren&#x27;t supported for `USER_MANAGED` type instance configurations.
          &quot;A String&quot;,
        ],
      },
    },
  ],
}

  x__xgafv: string, V1 error format.
    Allowed values
      1 - v1 error format
      2 - v2 error format

Returns:
  An object of the form:

    { # This resource represents a long-running operation that is the result of a network API call.
  &quot;done&quot;: True or False, # If the value is `false`, it means the operation is still in progress. If `true`, the operation is completed, and either `error` or `response` is available.
  &quot;error&quot;: { # The `Status` type defines a logical error model that is suitable for different programming environments, including REST APIs and RPC APIs. It is used by [gRPC](https://github.com/grpc). Each `Status` message contains three pieces of data: error code, error message, and error details. You can find out more about this error model and how to work with it in the [API Design Guide](https://cloud.google.com/apis/design/errors). # The error result of the operation in case of failure or cancellation.
    &quot;code&quot;: 42, # The status code, which should be an enum value of google.rpc.Code.
    &quot;details&quot;: [ # A list of messages that carry the error details. There is a common set of message types for APIs to use.
      {
        &quot;a_key&quot;: &quot;&quot;, # Properties of the object. Contains field @type with type URL.
      },
    ],
    &quot;message&quot;: &quot;A String&quot;, # A developer-facing error message, which should be in English. Any user-facing error message should be localized and sent in the google.rpc.Status.details field, or localized by the client.
  },
  &quot;metadata&quot;: { # Service-specific metadata associated with the operation. It typically contains progress information and common metadata such as create time. Some services might not provide such metadata. Any method that returns a long-running operation should document the metadata type, if any.
    &quot;a_key&quot;: &quot;&quot;, # Properties of the object. Contains field @type with type URL.
  },
  &quot;name&quot;: &quot;A String&quot;, # The server-assigned name, which is only unique within the same service that originally returns it. If you use the default HTTP mapping, the `name` should be a resource name ending with `operations/{unique_id}`.
  &quot;response&quot;: { # The normal, successful response of the operation. If the original method returns no data on success, such as `Delete`, the response is `google.protobuf.Empty`. If the original method is standard `Get`/`Create`/`Update`, the response should be the resource. For other methods, the response should have the type `XxxResponse`, where `Xxx` is the original method name. For example, if the original method name is `TakeSnapshot()`, the inferred response type is `TakeSnapshotResponse`.
    &quot;a_key&quot;: &quot;&quot;, # Properties of the object. Contains field @type with type URL.
  },
}</pre>
</div>

<div class="method">
    <code class="details" id="patch">patch(name, body=None, x__xgafv=None)</code>
  <pre>Updates an instance, and begins allocating or releasing resources as requested. The returned long-running operation can be used to track the progress of updating the instance. If the named instance does not exist, returns `NOT_FOUND`. Immediately upon completion of this request: * For resource types for which a decrease in the instance&#x27;s allocation has been requested, billing is based on the newly-requested level. Until completion of the returned operation: * Cancelling the operation sets its metadata&#x27;s cancel_time, and begins restoring resources to their pre-request values. The operation is guaranteed to succeed at undoing all resource changes, after which point it terminates with a `CANCELLED` status. * All other attempts to modify the instance are rejected. * Reading the instance via the API continues to give the pre-request resource levels. Upon completion of the returned operation: * Billing begins for all successfully-allocated resources (some types may have lower than the requested levels). * All newly-reserved resources are available for serving the instance&#x27;s tables. * The instance&#x27;s new resource levels are readable via the API. The returned long-running operation will have a name of the format `/operations/` and can be used to track the instance modification. The metadata field type is UpdateInstanceMetadata. The response field type is Instance, if successful. Authorization requires `spanner.instances.update` permission on the resource name.

Args:
  name: string, Required. A unique identifier for the instance, which cannot be changed after the instance is created. Values are of the form `projects//instances/a-z*[a-z0-9]`. The final segment of the name must be between 2 and 64 characters in length. (required)
  body: object, The request body.
    The object takes the form of:

{ # The request for UpdateInstance.
  &quot;fieldMask&quot;: &quot;A String&quot;, # Required. A mask specifying which fields in Instance should be updated. The field mask must always be specified; this prevents any future fields in Instance from being erased accidentally by clients that do not know about them.
  &quot;instance&quot;: { # An isolated set of Cloud Spanner resources on which databases can be hosted. # Required. The instance to update, which must always include the instance name. Otherwise, only fields mentioned in field_mask need be included.
    &quot;autoscalingConfig&quot;: { # Autoscaling configuration for an instance. # Optional. The autoscaling configuration. Autoscaling is enabled if this field is set. When autoscaling is enabled, node_count and processing_units are treated as OUTPUT_ONLY fields and reflect the current compute capacity allocated to the instance.
      &quot;asymmetricAutoscalingOptions&quot;: [ # Optional. Optional asymmetric autoscaling options. Replicas matching the replica selection criteria will be autoscaled independently from other replicas. The autoscaler will scale the replicas based on the utilization of replicas identified by the replica selection. Replica selections should not overlap with each other. Other replicas (those do not match any replica selection) will be autoscaled together and will have the same compute capacity allocated to them.
        { # AsymmetricAutoscalingOption specifies the scaling of replicas identified by the given selection.
          &quot;overrides&quot;: { # Overrides the top-level autoscaling configuration for the replicas identified by `replica_selection`. All fields in this message are optional. Any unspecified fields will use the corresponding values from the top-level autoscaling configuration. # Optional. Overrides applied to the top-level autoscaling configuration for the selected replicas.
            &quot;autoscalingLimits&quot;: { # The autoscaling limits for the instance. Users can define the minimum and maximum compute capacity allocated to the instance, and the autoscaler will only scale within that range. Users can either use nodes or processing units to specify the limits, but should use the same unit to set both the min_limit and max_limit. # Optional. If specified, overrides the min/max limit in the top-level autoscaling configuration for the selected replicas.
              &quot;maxNodes&quot;: 42, # Maximum number of nodes allocated to the instance. If set, this number should be greater than or equal to min_nodes.
              &quot;maxProcessingUnits&quot;: 42, # Maximum number of processing units allocated to the instance. If set, this number should be multiples of 1000 and be greater than or equal to min_processing_units.
              &quot;minNodes&quot;: 42, # Minimum number of nodes allocated to the instance. If set, this number should be greater than or equal to 1.
              &quot;minProcessingUnits&quot;: 42, # Minimum number of processing units allocated to the instance. If set, this number should be multiples of 1000.
            },
            &quot;autoscalingTargetHighPriorityCpuUtilizationPercent&quot;: 42, # Optional. If specified, overrides the autoscaling target high_priority_cpu_utilization_percent in the top-level autoscaling configuration for the selected replicas.
          },
          &quot;replicaSelection&quot;: { # ReplicaSelection identifies replicas with common properties. # Required. Selects the replicas to which this AsymmetricAutoscalingOption applies. Only read-only replicas are supported.
            &quot;location&quot;: &quot;A String&quot;, # Required. Name of the location of the replicas (for example, &quot;us-central1&quot;).
          },
        },
      ],
      &quot;autoscalingLimits&quot;: { # The autoscaling limits for the instance. Users can define the minimum and maximum compute capacity allocated to the instance, and the autoscaler will only scale within that range. Users can either use nodes or processing units to specify the limits, but should use the same unit to set both the min_limit and max_limit. # Required. Autoscaling limits for an instance.
        &quot;maxNodes&quot;: 42, # Maximum number of nodes allocated to the instance. If set, this number should be greater than or equal to min_nodes.
        &quot;maxProcessingUnits&quot;: 42, # Maximum number of processing units allocated to the instance. If set, this number should be multiples of 1000 and be greater than or equal to min_processing_units.
        &quot;minNodes&quot;: 42, # Minimum number of nodes allocated to the instance. If set, this number should be greater than or equal to 1.
        &quot;minProcessingUnits&quot;: 42, # Minimum number of processing units allocated to the instance. If set, this number should be multiples of 1000.
      },
      &quot;autoscalingTargets&quot;: { # The autoscaling targets for an instance. # Required. The autoscaling targets for an instance.
        &quot;highPriorityCpuUtilizationPercent&quot;: 42, # Required. The target high priority cpu utilization percentage that the autoscaler should be trying to achieve for the instance. This number is on a scale from 0 (no utilization) to 100 (full utilization). The valid range is [10, 90] inclusive.
        &quot;storageUtilizationPercent&quot;: 42, # Required. The target storage utilization percentage that the autoscaler should be trying to achieve for the instance. This number is on a scale from 0 (no utilization) to 100 (full utilization). The valid range is [10, 99] inclusive.
      },
    },
    &quot;config&quot;: &quot;A String&quot;, # Required. The name of the instance&#x27;s configuration. Values are of the form `projects//instanceConfigs/`. See also InstanceConfig and ListInstanceConfigs.
    &quot;createTime&quot;: &quot;A String&quot;, # Output only. The time at which the instance was created.
    &quot;defaultBackupScheduleType&quot;: &quot;A String&quot;, # Optional. Controls the default backup schedule behavior for new databases within the instance. By default, a backup schedule is created automatically when a new database is created in a new instance. Note that the `AUTOMATIC` value isn&#x27;t permitted for free instances, as backups and backup schedules aren&#x27;t supported for free instances. In the `GetInstance` or `ListInstances` response, if the value of `default_backup_schedule_type` isn&#x27;t set, or set to `NONE`, Spanner doesn&#x27;t create a default backup schedule for new databases in the instance.
    &quot;displayName&quot;: &quot;A String&quot;, # Required. The descriptive name for this instance as it appears in UIs. Must be unique per project and between 4 and 30 characters in length.
    &quot;edition&quot;: &quot;A String&quot;, # Optional. The `Edition` of the current instance.
    &quot;endpointUris&quot;: [ # Deprecated. This field is not populated.
      &quot;A String&quot;,
    ],
    &quot;freeInstanceMetadata&quot;: { # Free instance specific metadata that is kept even after an instance has been upgraded for tracking purposes. # Free instance metadata. Only populated for free instances.
      &quot;expireBehavior&quot;: &quot;A String&quot;, # Specifies the expiration behavior of a free instance. The default of ExpireBehavior is `REMOVE_AFTER_GRACE_PERIOD`. This can be modified during or after creation, and before expiration.
      &quot;expireTime&quot;: &quot;A String&quot;, # Output only. Timestamp after which the instance will either be upgraded or scheduled for deletion after a grace period. ExpireBehavior is used to choose between upgrading or scheduling the free instance for deletion. This timestamp is set during the creation of a free instance.
      &quot;upgradeTime&quot;: &quot;A String&quot;, # Output only. If present, the timestamp at which the free instance was upgraded to a provisioned instance.
    },
    &quot;instanceType&quot;: &quot;A String&quot;, # The `InstanceType` of the current instance.
    &quot;labels&quot;: { # Cloud Labels are a flexible and lightweight mechanism for organizing cloud resources into groups that reflect a customer&#x27;s organizational needs and deployment strategies. Cloud Labels can be used to filter collections of resources. They can be used to control how resource metrics are aggregated. And they can be used as arguments to policy management rules (e.g. route, firewall, load balancing, etc.). * Label keys must be between 1 and 63 characters long and must conform to the following regular expression: `a-z{0,62}`. * Label values must be between 0 and 63 characters long and must conform to the regular expression `[a-z0-9_-]{0,63}`. * No more than 64 labels can be associated with a given resource. See https://goo.gl/xmQnxf for more information on and examples of labels. If you plan to use labels in your own code, please note that additional characters may be allowed in the future. And so you are advised to use an internal label representation, such as JSON, which doesn&#x27;t rely upon specific characters being disallowed. For example, representing labels as the string: name + &quot;_&quot; + value would prove problematic if we were to allow &quot;_&quot; in a future release.
      &quot;a_key&quot;: &quot;A String&quot;,
    },
    &quot;name&quot;: &quot;A String&quot;, # Required. A unique identifier for the instance, which cannot be changed after the instance is created. Values are of the form `projects//instances/a-z*[a-z0-9]`. The final segment of the name must be between 2 and 64 characters in length.
    &quot;nodeCount&quot;: 42, # The number of nodes allocated to this instance. At most, one of either `node_count` or `processing_units` should be present in the message. Users can set the `node_count` field to specify the target number of nodes allocated to the instance. If autoscaling is enabled, `node_count` is treated as an `OUTPUT_ONLY` field and reflects the current number of nodes allocated to the instance. This might be zero in API responses for instances that are not yet in the `READY` state. If the instance has varying node count across replicas (achieved by setting `asymmetric_autoscaling_options` in the autoscaling configuration), the `node_count` set here is the maximum node count across all replicas. For more information, see [Compute capacity, nodes, and processing units](https://cloud.google.com/spanner/docs/compute-capacity).
    &quot;processingUnits&quot;: 42, # The number of processing units allocated to this instance. At most, one of either `processing_units` or `node_count` should be present in the message. Users can set the `processing_units` field to specify the target number of processing units allocated to the instance. If autoscaling is enabled, `processing_units` is treated as an `OUTPUT_ONLY` field and reflects the current number of processing units allocated to the instance. This might be zero in API responses for instances that are not yet in the `READY` state. If the instance has varying processing units per replica (achieved by setting `asymmetric_autoscaling_options` in the autoscaling configuration), the `processing_units` set here is the maximum processing units across all replicas. For more information, see [Compute capacity, nodes and processing units](https://cloud.google.com/spanner/docs/compute-capacity).
    &quot;replicaComputeCapacity&quot;: [ # Output only. Lists the compute capacity per ReplicaSelection. A replica selection identifies a set of replicas with common properties. Replicas identified by a ReplicaSelection are scaled with the same compute capacity.
      { # ReplicaComputeCapacity describes the amount of server resources that are allocated to each replica identified by the replica selection.
        &quot;nodeCount&quot;: 42, # The number of nodes allocated to each replica. This may be zero in API responses for instances that are not yet in state `READY`.
        &quot;processingUnits&quot;: 42, # The number of processing units allocated to each replica. This may be zero in API responses for instances that are not yet in state `READY`.
        &quot;replicaSelection&quot;: { # ReplicaSelection identifies replicas with common properties. # Required. Identifies replicas by specified properties. All replicas in the selection have the same amount of compute capacity.
          &quot;location&quot;: &quot;A String&quot;, # Required. Name of the location of the replicas (for example, &quot;us-central1&quot;).
        },
      },
    ],
    &quot;state&quot;: &quot;A String&quot;, # Output only. The current instance state. For CreateInstance, the state must be either omitted or set to `CREATING`. For UpdateInstance, the state must be either omitted or set to `READY`.
    &quot;updateTime&quot;: &quot;A String&quot;, # Output only. The time at which the instance was most recently updated.
  },
}

  x__xgafv: string, V1 error format.
    Allowed values
      1 - v1 error format
      2 - v2 error format

Returns:
  An object of the form:

    { # This resource represents a long-running operation that is the result of a network API call.
  &quot;done&quot;: True or False, # If the value is `false`, it means the operation is still in progress. If `true`, the operation is completed, and either `error` or `response` is available.
  &quot;error&quot;: { # The `Status` type defines a logical error model that is suitable for different programming environments, including REST APIs and RPC APIs. It is used by [gRPC](https://github.com/grpc). Each `Status` message contains three pieces of data: error code, error message, and error details. You can find out more about this error model and how to work with it in the [API Design Guide](https://cloud.google.com/apis/design/errors). # The error result of the operation in case of failure or cancellation.
    &quot;code&quot;: 42, # The status code, which should be an enum value of google.rpc.Code.
    &quot;details&quot;: [ # A list of messages that carry the error details. There is a common set of message types for APIs to use.
      {
        &quot;a_key&quot;: &quot;&quot;, # Properties of the object. Contains field @type with type URL.
      },
    ],
    &quot;message&quot;: &quot;A String&quot;, # A developer-facing error message, which should be in English. Any user-facing error message should be localized and sent in the google.rpc.Status.details field, or localized by the client.
  },
  &quot;metadata&quot;: { # Service-specific metadata associated with the operation. It typically contains progress information and common metadata such as create time. Some services might not provide such metadata. Any method that returns a long-running operation should document the metadata type, if any.
    &quot;a_key&quot;: &quot;&quot;, # Properties of the object. Contains field @type with type URL.
  },
  &quot;name&quot;: &quot;A String&quot;, # The server-assigned name, which is only unique within the same service that originally returns it. If you use the default HTTP mapping, the `name` should be a resource name ending with `operations/{unique_id}`.
  &quot;response&quot;: { # The normal, successful response of the operation. If the original method returns no data on success, such as `Delete`, the response is `google.protobuf.Empty`. If the original method is standard `Get`/`Create`/`Update`, the response should be the resource. For other methods, the response should have the type `XxxResponse`, where `Xxx` is the original method name. For example, if the original method name is `TakeSnapshot()`, the inferred response type is `TakeSnapshotResponse`.
    &quot;a_key&quot;: &quot;&quot;, # Properties of the object. Contains field @type with type URL.
  },
}</pre>
</div>

<div class="method">
    <code class="details" id="setIamPolicy">setIamPolicy(resource, body=None, x__xgafv=None)</code>
  <pre>Sets the access control policy on an instance resource. Replaces any existing policy. Authorization requires `spanner.instances.setIamPolicy` on resource.

Args:
  resource: string, REQUIRED: The Cloud Spanner resource for which the policy is being set. The format is `projects//instances/` for instance resources and `projects//instances//databases/` for databases resources. (required)
  body: object, The request body.
    The object takes the form of:

{ # Request message for `SetIamPolicy` method.
  &quot;policy&quot;: { # An Identity and Access Management (IAM) policy, which specifies access controls for Google Cloud resources. A `Policy` is a collection of `bindings`. A `binding` binds one or more `members`, or principals, to a single `role`. Principals can be user accounts, service accounts, Google groups, and domains (such as G Suite). A `role` is a named list of permissions; each `role` can be an IAM predefined role or a user-created custom role. For some types of Google Cloud resources, a `binding` can also specify a `condition`, which is a logical expression that allows access to a resource only if the expression evaluates to `true`. A condition can add constraints based on attributes of the request, the resource, or both. To learn which resources support conditions in their IAM policies, see the [IAM documentation](https://cloud.google.com/iam/help/conditions/resource-policies). **JSON example:** ``` { &quot;bindings&quot;: [ { &quot;role&quot;: &quot;roles/resourcemanager.organizationAdmin&quot;, &quot;members&quot;: [ &quot;user:mike@example.com&quot;, &quot;group:admins@example.com&quot;, &quot;domain:google.com&quot;, &quot;serviceAccount:my-project-id@appspot.gserviceaccount.com&quot; ] }, { &quot;role&quot;: &quot;roles/resourcemanager.organizationViewer&quot;, &quot;members&quot;: [ &quot;user:eve@example.com&quot; ], &quot;condition&quot;: { &quot;title&quot;: &quot;expirable access&quot;, &quot;description&quot;: &quot;Does not grant access after Sep 2020&quot;, &quot;expression&quot;: &quot;request.time &lt; timestamp(&#x27;2020-10-01T00:00:00.000Z&#x27;)&quot;, } } ], &quot;etag&quot;: &quot;BwWWja0YfJA=&quot;, &quot;version&quot;: 3 } ``` **YAML example:** ``` bindings: - members: - user:mike@example.com - group:admins@example.com - domain:google.com - serviceAccount:my-project-id@appspot.gserviceaccount.com role: roles/resourcemanager.organizationAdmin - members: - user:eve@example.com role: roles/resourcemanager.organizationViewer condition: title: expirable access description: Does not grant access after Sep 2020 expression: request.time &lt; timestamp(&#x27;2020-10-01T00:00:00.000Z&#x27;) etag: BwWWja0YfJA= version: 3 ``` For a description of IAM and its features, see the [IAM documentation](https://cloud.google.com/iam/docs/). # REQUIRED: The complete policy to be applied to the `resource`. The size of the policy is limited to a few 10s of KB. An empty policy is a valid policy but certain Google Cloud services (such as Projects) might reject them.
    &quot;bindings&quot;: [ # Associates a list of `members`, or principals, with a `role`. Optionally, may specify a `condition` that determines how and when the `bindings` are applied. Each of the `bindings` must contain at least one principal. The `bindings` in a `Policy` can refer to up to 1,500 principals; up to 250 of these principals can be Google groups. Each occurrence of a principal counts towards these limits. For example, if the `bindings` grant 50 different roles to `user:alice@example.com`, and not to any other principal, then you can add another 1,450 principals to the `bindings` in the `Policy`.
      { # Associates `members`, or principals, with a `role`.
        &quot;condition&quot;: { # Represents a textual expression in the Common Expression Language (CEL) syntax. CEL is a C-like expression language. The syntax and semantics of CEL are documented at https://github.com/google/cel-spec. Example (Comparison): title: &quot;Summary size limit&quot; description: &quot;Determines if a summary is less than 100 chars&quot; expression: &quot;document.summary.size() &lt; 100&quot; Example (Equality): title: &quot;Requestor is owner&quot; description: &quot;Determines if requestor is the document owner&quot; expression: &quot;document.owner == request.auth.claims.email&quot; Example (Logic): title: &quot;Public documents&quot; description: &quot;Determine whether the document should be publicly visible&quot; expression: &quot;document.type != &#x27;private&#x27; &amp;&amp; document.type != &#x27;internal&#x27;&quot; Example (Data Manipulation): title: &quot;Notification string&quot; description: &quot;Create a notification string with a timestamp.&quot; expression: &quot;&#x27;New message received at &#x27; + string(document.create_time)&quot; The exact variables and functions that may be referenced within an expression are determined by the service that evaluates it. See the service documentation for additional information. # The condition that is associated with this binding. If the condition evaluates to `true`, then this binding applies to the current request. If the condition evaluates to `false`, then this binding does not apply to the current request. However, a different role binding might grant the same role to one or more of the principals in this binding. To learn which resources support conditions in their IAM policies, see the [IAM documentation](https://cloud.google.com/iam/help/conditions/resource-policies).
          &quot;description&quot;: &quot;A String&quot;, # Optional. Description of the expression. This is a longer text which describes the expression, e.g. when hovered over it in a UI.
          &quot;expression&quot;: &quot;A String&quot;, # Textual representation of an expression in Common Expression Language syntax.
          &quot;location&quot;: &quot;A String&quot;, # Optional. String indicating the location of the expression for error reporting, e.g. a file name and a position in the file.
          &quot;title&quot;: &quot;A String&quot;, # Optional. Title for the expression, i.e. a short string describing its purpose. This can be used e.g. in UIs which allow to enter the expression.
        },
        &quot;members&quot;: [ # Specifies the principals requesting access for a Google Cloud resource. `members` can have the following values: * `allUsers`: A special identifier that represents anyone who is on the internet; with or without a Google account. * `allAuthenticatedUsers`: A special identifier that represents anyone who is authenticated with a Google account or a service account. Does not include identities that come from external identity providers (IdPs) through identity federation. * `user:{emailid}`: An email address that represents a specific Google account. For example, `alice@example.com` . * `serviceAccount:{emailid}`: An email address that represents a Google service account. For example, `my-other-app@appspot.gserviceaccount.com`. * `serviceAccount:{projectid}.svc.id.goog[{namespace}/{kubernetes-sa}]`: An identifier for a [Kubernetes service account](https://cloud.google.com/kubernetes-engine/docs/how-to/kubernetes-service-accounts). For example, `my-project.svc.id.goog[my-namespace/my-kubernetes-sa]`. * `group:{emailid}`: An email address that represents a Google group. For example, `admins@example.com`. * `domain:{domain}`: The G Suite domain (primary) that represents all the users of that domain. For example, `google.com` or `example.com`. * `principal://iam.googleapis.com/locations/global/workforcePools/{pool_id}/subject/{subject_attribute_value}`: A single identity in a workforce identity pool. * `principalSet://iam.googleapis.com/locations/global/workforcePools/{pool_id}/group/{group_id}`: All workforce identities in a group. * `principalSet://iam.googleapis.com/locations/global/workforcePools/{pool_id}/attribute.{attribute_name}/{attribute_value}`: All workforce identities with a specific attribute value. * `principalSet://iam.googleapis.com/locations/global/workforcePools/{pool_id}/*`: All identities in a workforce identity pool. * `principal://iam.googleapis.com/projects/{project_number}/locations/global/workloadIdentityPools/{pool_id}/subject/{subject_attribute_value}`: A single identity in a workload identity pool. * `principalSet://iam.googleapis.com/projects/{project_number}/locations/global/workloadIdentityPools/{pool_id}/group/{group_id}`: A workload identity pool group. * `principalSet://iam.googleapis.com/projects/{project_number}/locations/global/workloadIdentityPools/{pool_id}/attribute.{attribute_name}/{attribute_value}`: All identities in a workload identity pool with a certain attribute. * `principalSet://iam.googleapis.com/projects/{project_number}/locations/global/workloadIdentityPools/{pool_id}/*`: All identities in a workload identity pool. * `deleted:user:{emailid}?uid={uniqueid}`: An email address (plus unique identifier) representing a user that has been recently deleted. For example, `alice@example.com?uid=123456789012345678901`. If the user is recovered, this value reverts to `user:{emailid}` and the recovered user retains the role in the binding. * `deleted:serviceAccount:{emailid}?uid={uniqueid}`: An email address (plus unique identifier) representing a service account that has been recently deleted. For example, `my-other-app@appspot.gserviceaccount.com?uid=123456789012345678901`. If the service account is undeleted, this value reverts to `serviceAccount:{emailid}` and the undeleted service account retains the role in the binding. * `deleted:group:{emailid}?uid={uniqueid}`: An email address (plus unique identifier) representing a Google group that has been recently deleted. For example, `admins@example.com?uid=123456789012345678901`. If the group is recovered, this value reverts to `group:{emailid}` and the recovered group retains the role in the binding. * `deleted:principal://iam.googleapis.com/locations/global/workforcePools/{pool_id}/subject/{subject_attribute_value}`: Deleted single identity in a workforce identity pool. For example, `deleted:principal://iam.googleapis.com/locations/global/workforcePools/my-pool-id/subject/my-subject-attribute-value`.
          &quot;A String&quot;,
        ],
        &quot;role&quot;: &quot;A String&quot;, # Role that is assigned to the list of `members`, or principals. For example, `roles/viewer`, `roles/editor`, or `roles/owner`. For an overview of the IAM roles and permissions, see the [IAM documentation](https://cloud.google.com/iam/docs/roles-overview). For a list of the available pre-defined roles, see [here](https://cloud.google.com/iam/docs/understanding-roles).
      },
    ],
    &quot;etag&quot;: &quot;A String&quot;, # `etag` is used for optimistic concurrency control as a way to help prevent simultaneous updates of a policy from overwriting each other. It is strongly suggested that systems make use of the `etag` in the read-modify-write cycle to perform policy updates in order to avoid race conditions: An `etag` is returned in the response to `getIamPolicy`, and systems are expected to put that etag in the request to `setIamPolicy` to ensure that their change will be applied to the same version of the policy. **Important:** If you use IAM Conditions, you must include the `etag` field whenever you call `setIamPolicy`. If you omit this field, then IAM allows you to overwrite a version `3` policy with a version `1` policy, and all of the conditions in the version `3` policy are lost.
    &quot;version&quot;: 42, # Specifies the format of the policy. Valid values are `0`, `1`, and `3`. Requests that specify an invalid value are rejected. Any operation that affects conditional role bindings must specify version `3`. This requirement applies to the following operations: * Getting a policy that includes a conditional role binding * Adding a conditional role binding to a policy * Changing a conditional role binding in a policy * Removing any role binding, with or without a condition, from a policy that includes conditions **Important:** If you use IAM Conditions, you must include the `etag` field whenever you call `setIamPolicy`. If you omit this field, then IAM allows you to overwrite a version `3` policy with a version `1` policy, and all of the conditions in the version `3` policy are lost. If a policy does not include any conditions, operations on that policy may specify any valid version or leave the field unset. To learn which resources support conditions in their IAM policies, see the [IAM documentation](https://cloud.google.com/iam/help/conditions/resource-policies).
  },
}

  x__xgafv: string, V1 error format.
    Allowed values
      1 - v1 error format
      2 - v2 error format

Returns:
  An object of the form:

    { # An Identity and Access Management (IAM) policy, which specifies access controls for Google Cloud resources. A `Policy` is a collection of `bindings`. A `binding` binds one or more `members`, or principals, to a single `role`. Principals can be user accounts, service accounts, Google groups, and domains (such as G Suite). A `role` is a named list of permissions; each `role` can be an IAM predefined role or a user-created custom role. For some types of Google Cloud resources, a `binding` can also specify a `condition`, which is a logical expression that allows access to a resource only if the expression evaluates to `true`. A condition can add constraints based on attributes of the request, the resource, or both. To learn which resources support conditions in their IAM policies, see the [IAM documentation](https://cloud.google.com/iam/help/conditions/resource-policies). **JSON example:** ``` { &quot;bindings&quot;: [ { &quot;role&quot;: &quot;roles/resourcemanager.organizationAdmin&quot;, &quot;members&quot;: [ &quot;user:mike@example.com&quot;, &quot;group:admins@example.com&quot;, &quot;domain:google.com&quot;, &quot;serviceAccount:my-project-id@appspot.gserviceaccount.com&quot; ] }, { &quot;role&quot;: &quot;roles/resourcemanager.organizationViewer&quot;, &quot;members&quot;: [ &quot;user:eve@example.com&quot; ], &quot;condition&quot;: { &quot;title&quot;: &quot;expirable access&quot;, &quot;description&quot;: &quot;Does not grant access after Sep 2020&quot;, &quot;expression&quot;: &quot;request.time &lt; timestamp(&#x27;2020-10-01T00:00:00.000Z&#x27;)&quot;, } } ], &quot;etag&quot;: &quot;BwWWja0YfJA=&quot;, &quot;version&quot;: 3 } ``` **YAML example:** ``` bindings: - members: - user:mike@example.com - group:admins@example.com - domain:google.com - serviceAccount:my-project-id@appspot.gserviceaccount.com role: roles/resourcemanager.organizationAdmin - members: - user:eve@example.com role: roles/resourcemanager.organizationViewer condition: title: expirable access description: Does not grant access after Sep 2020 expression: request.time &lt; timestamp(&#x27;2020-10-01T00:00:00.000Z&#x27;) etag: BwWWja0YfJA= version: 3 ``` For a description of IAM and its features, see the [IAM documentation](https://cloud.google.com/iam/docs/).
  &quot;bindings&quot;: [ # Associates a list of `members`, or principals, with a `role`. Optionally, may specify a `condition` that determines how and when the `bindings` are applied. Each of the `bindings` must contain at least one principal. The `bindings` in a `Policy` can refer to up to 1,500 principals; up to 250 of these principals can be Google groups. Each occurrence of a principal counts towards these limits. For example, if the `bindings` grant 50 different roles to `user:alice@example.com`, and not to any other principal, then you can add another 1,450 principals to the `bindings` in the `Policy`.
    { # Associates `members`, or principals, with a `role`.
      &quot;condition&quot;: { # Represents a textual expression in the Common Expression Language (CEL) syntax. CEL is a C-like expression language. The syntax and semantics of CEL are documented at https://github.com/google/cel-spec. Example (Comparison): title: &quot;Summary size limit&quot; description: &quot;Determines if a summary is less than 100 chars&quot; expression: &quot;document.summary.size() &lt; 100&quot; Example (Equality): title: &quot;Requestor is owner&quot; description: &quot;Determines if requestor is the document owner&quot; expression: &quot;document.owner == request.auth.claims.email&quot; Example (Logic): title: &quot;Public documents&quot; description: &quot;Determine whether the document should be publicly visible&quot; expression: &quot;document.type != &#x27;private&#x27; &amp;&amp; document.type != &#x27;internal&#x27;&quot; Example (Data Manipulation): title: &quot;Notification string&quot; description: &quot;Create a notification string with a timestamp.&quot; expression: &quot;&#x27;New message received at &#x27; + string(document.create_time)&quot; The exact variables and functions that may be referenced within an expression are determined by the service that evaluates it. See the service documentation for additional information. # The condition that is associated with this binding. If the condition evaluates to `true`, then this binding applies to the current request. If the condition evaluates to `false`, then this binding does not apply to the current request. However, a different role binding might grant the same role to one or more of the principals in this binding. To learn which resources support conditions in their IAM policies, see the [IAM documentation](https://cloud.google.com/iam/help/conditions/resource-policies).
        &quot;description&quot;: &quot;A String&quot;, # Optional. Description of the expression. This is a longer text which describes the expression, e.g. when hovered over it in a UI.
        &quot;expression&quot;: &quot;A String&quot;, # Textual representation of an expression in Common Expression Language syntax.
        &quot;location&quot;: &quot;A String&quot;, # Optional. String indicating the location of the expression for error reporting, e.g. a file name and a position in the file.
        &quot;title&quot;: &quot;A String&quot;, # Optional. Title for the expression, i.e. a short string describing its purpose. This can be used e.g. in UIs which allow to enter the expression.
      },
      &quot;members&quot;: [ # Specifies the principals requesting access for a Google Cloud resource. `members` can have the following values: * `allUsers`: A special identifier that represents anyone who is on the internet; with or without a Google account. * `allAuthenticatedUsers`: A special identifier that represents anyone who is authenticated with a Google account or a service account. Does not include identities that come from external identity providers (IdPs) through identity federation. * `user:{emailid}`: An email address that represents a specific Google account. For example, `alice@example.com` . * `serviceAccount:{emailid}`: An email address that represents a Google service account. For example, `my-other-app@appspot.gserviceaccount.com`. * `serviceAccount:{projectid}.svc.id.goog[{namespace}/{kubernetes-sa}]`: An identifier for a [Kubernetes service account](https://cloud.google.com/kubernetes-engine/docs/how-to/kubernetes-service-accounts). For example, `my-project.svc.id.goog[my-namespace/my-kubernetes-sa]`. * `group:{emailid}`: An email address that represents a Google group. For example, `admins@example.com`. * `domain:{domain}`: The G Suite domain (primary) that represents all the users of that domain. For example, `google.com` or `example.com`. * `principal://iam.googleapis.com/locations/global/workforcePools/{pool_id}/subject/{subject_attribute_value}`: A single identity in a workforce identity pool. * `principalSet://iam.googleapis.com/locations/global/workforcePools/{pool_id}/group/{group_id}`: All workforce identities in a group. * `principalSet://iam.googleapis.com/locations/global/workforcePools/{pool_id}/attribute.{attribute_name}/{attribute_value}`: All workforce identities with a specific attribute value. * `principalSet://iam.googleapis.com/locations/global/workforcePools/{pool_id}/*`: All identities in a workforce identity pool. * `principal://iam.googleapis.com/projects/{project_number}/locations/global/workloadIdentityPools/{pool_id}/subject/{subject_attribute_value}`: A single identity in a workload identity pool. * `principalSet://iam.googleapis.com/projects/{project_number}/locations/global/workloadIdentityPools/{pool_id}/group/{group_id}`: A workload identity pool group. * `principalSet://iam.googleapis.com/projects/{project_number}/locations/global/workloadIdentityPools/{pool_id}/attribute.{attribute_name}/{attribute_value}`: All identities in a workload identity pool with a certain attribute. * `principalSet://iam.googleapis.com/projects/{project_number}/locations/global/workloadIdentityPools/{pool_id}/*`: All identities in a workload identity pool. * `deleted:user:{emailid}?uid={uniqueid}`: An email address (plus unique identifier) representing a user that has been recently deleted. For example, `alice@example.com?uid=123456789012345678901`. If the user is recovered, this value reverts to `user:{emailid}` and the recovered user retains the role in the binding. * `deleted:serviceAccount:{emailid}?uid={uniqueid}`: An email address (plus unique identifier) representing a service account that has been recently deleted. For example, `my-other-app@appspot.gserviceaccount.com?uid=123456789012345678901`. If the service account is undeleted, this value reverts to `serviceAccount:{emailid}` and the undeleted service account retains the role in the binding. * `deleted:group:{emailid}?uid={uniqueid}`: An email address (plus unique identifier) representing a Google group that has been recently deleted. For example, `admins@example.com?uid=123456789012345678901`. If the group is recovered, this value reverts to `group:{emailid}` and the recovered group retains the role in the binding. * `deleted:principal://iam.googleapis.com/locations/global/workforcePools/{pool_id}/subject/{subject_attribute_value}`: Deleted single identity in a workforce identity pool. For example, `deleted:principal://iam.googleapis.com/locations/global/workforcePools/my-pool-id/subject/my-subject-attribute-value`.
        &quot;A String&quot;,
      ],
      &quot;role&quot;: &quot;A String&quot;, # Role that is assigned to the list of `members`, or principals. For example, `roles/viewer`, `roles/editor`, or `roles/owner`. For an overview of the IAM roles and permissions, see the [IAM documentation](https://cloud.google.com/iam/docs/roles-overview). For a list of the available pre-defined roles, see [here](https://cloud.google.com/iam/docs/understanding-roles).
    },
  ],
  &quot;etag&quot;: &quot;A String&quot;, # `etag` is used for optimistic concurrency control as a way to help prevent simultaneous updates of a policy from overwriting each other. It is strongly suggested that systems make use of the `etag` in the read-modify-write cycle to perform policy updates in order to avoid race conditions: An `etag` is returned in the response to `getIamPolicy`, and systems are expected to put that etag in the request to `setIamPolicy` to ensure that their change will be applied to the same version of the policy. **Important:** If you use IAM Conditions, you must include the `etag` field whenever you call `setIamPolicy`. If you omit this field, then IAM allows you to overwrite a version `3` policy with a version `1` policy, and all of the conditions in the version `3` policy are lost.
  &quot;version&quot;: 42, # Specifies the format of the policy. Valid values are `0`, `1`, and `3`. Requests that specify an invalid value are rejected. Any operation that affects conditional role bindings must specify version `3`. This requirement applies to the following operations: * Getting a policy that includes a conditional role binding * Adding a conditional role binding to a policy * Changing a conditional role binding in a policy * Removing any role binding, with or without a condition, from a policy that includes conditions **Important:** If you use IAM Conditions, you must include the `etag` field whenever you call `setIamPolicy`. If you omit this field, then IAM allows you to overwrite a version `3` policy with a version `1` policy, and all of the conditions in the version `3` policy are lost. If a policy does not include any conditions, operations on that policy may specify any valid version or leave the field unset. To learn which resources support conditions in their IAM policies, see the [IAM documentation](https://cloud.google.com/iam/help/conditions/resource-policies).
}</pre>
</div>

<div class="method">
    <code class="details" id="testIamPermissions">testIamPermissions(resource, body=None, x__xgafv=None)</code>
  <pre>Returns permissions that the caller has on the specified instance resource. Attempting this RPC on a non-existent Cloud Spanner instance resource will result in a NOT_FOUND error if the user has `spanner.instances.list` permission on the containing Google Cloud Project. Otherwise returns an empty set of permissions.

Args:
  resource: string, REQUIRED: The Cloud Spanner resource for which permissions are being tested. The format is `projects//instances/` for instance resources and `projects//instances//databases/` for database resources. (required)
  body: object, The request body.
    The object takes the form of:

{ # Request message for `TestIamPermissions` method.
  &quot;permissions&quot;: [ # REQUIRED: The set of permissions to check for &#x27;resource&#x27;. Permissions with wildcards (such as &#x27;*&#x27;, &#x27;spanner.*&#x27;, &#x27;spanner.instances.*&#x27;) are not allowed.
    &quot;A String&quot;,
  ],
}

  x__xgafv: string, V1 error format.
    Allowed values
      1 - v1 error format
      2 - v2 error format

Returns:
  An object of the form:

    { # Response message for `TestIamPermissions` method.
  &quot;permissions&quot;: [ # A subset of `TestPermissionsRequest.permissions` that the caller is allowed.
    &quot;A String&quot;,
  ],
}</pre>
</div>

</body></html>